The dispute is over changes to firefighters' pensions and working arrangements. The Government increased contribution costs for firefighters for the third year running and increased the age firefighters are expected to work until to 60.

As a result there has been a series of strikes. RBFRS have contingency arrangements to provide cover during the industrial action which involves using firefighters who would not otherwise be working.

Mr Fry said: "There is a very high level of FBU membership in Berkshire. During times of industrial action we call on firefighters who wouldn't otherwise be working, it's a very expensive business."

Mr Fry said the outcome of the dispute will be determined by the general election.